(7352) 1994 CO

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(7352) 1994 CO
Discovery [1]
Discovered by S. Ueda
H. Kaneda
Discovery site Kushiro Obs.
Discovery date 4 February 1994
MPC designation (7352) 1994 CO
1994 CO · 1991 VD3
Jupiter trojan[1]
(Trojan camp)[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 28.62 yr (10,452 days)
Aphelion 5.3238 AU
Perihelion 4.9430 AU
5.1334 AU
Eccentricity 0.0371
11.63 yr (4,248 days)
0° 5m 4.92s / day
Inclination 8.1809°
Jupiter MOID 0.0297 AU
TJupiter 2.9790
Physical characteristics
Dimensions 47.07±2.06 km[3]
47.73±0.79 km[4]
47.731±0.789 km[5]
58.29 km (calculated)[6]
648±3 h[7]
0.057 (assumed)[6]
C (assumed)[6]
9.00[3] · 9.8[4] · 9.9[1][6]

(7352) 1994 CO is a Jupiter trojan from the Trojan camp, approximately 48 kilometers in diameter. It is also a tumbler and an exceptional slow rotator, the asteroid was discovered on 4 February 1994, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory in Kushiro, Japan.[8]

Classification and orbit[edit]

The dark C-type Jovian asteroid resides in Jupiter's L5 Lagrangian point (Trojan camp), which lies 60° behind the gas giant's orbit. It orbits the Sun at a distance of 4.9–5.3 AU once every 11 years and 8 months (4,248 days). Its orbit has an eccentricity of 0.04 and an inclination of 8° with respect to the ecliptic.[1]

A first precovery was taken at Palomar Observatory in 1988, extending the body's observation arc by 6 years prior to its discovery.[8]

Physical characteristics[edit]

Rotation period[edit]

In October 2013, a rotational lightcurve was obtained for this asteroid from photometric observations by American amateur astronomer Robert Stephens at the CS3–Trojan Station (U81) in Landers, California. It gave a well-defined, outstandingly long rotation period of 648±3 hours with a brightness variation of 0.30 magnitude (U=3-).[7] As of 2016, there are only about two dozens exceptionally slowly rotating objects known with periods longer than 600 hours.


The astronomers also detected a non-principal axis rotation seen in distinct rotational cycles in successive order, this is commonly known as tumbling.[7] 1994 CO is the six-largest asteroid and the second-largest Jupiter trojan after 4902 Thessandrus known to be is such a state (also see List of tumblers).

Diameter and albedo[edit]

According to the space-based surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 47.1 and 47.7 kilometers in diameter and its surface has an albedo of 0.093 and 0.21, respectively.[3][4][5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a significantly larger diameter of 58.3 kilometers, based on an absolute magnitude of 9.9.[6]


As of 2017, 1994 CO remains unnamed.[8]


  1. ^ a b c d e "JPL Small-Body Database Browser: 7352 (1994 CO)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017. 
  2. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 29 June 2016. 
  3. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 31 August 2016. 
  4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 31 August 2016. 
  5. ^ a b c Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 31 August 2016. 
  6. ^ a b c d e "LCDB Data for (7352)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016. 
  7. ^ a b c Stephens, Robert D.; French, Linda M.; Davitt, Chelsea; Coley, Daniel R. (April 2014). "At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013". The Minor Planet Bulletin. 41 (2): 95–100. Bibcode:2014MPBu...41...95S. ISSN 1052-8091. Retrieved 31 August 2016. 
  8. ^ a b c "7352 (1994 CO)". Minor Planet Center. Retrieved 31 August 2016. 

External links[edit]